The notations representing the different isotopes of the element sodium are:
4) 22Na and 23Na
The total number of recognized isotopes of sodium is 20. It starts from 18Na upto 37Na with two isomers (22mNa and 24mNa).
23Na is considered as monoisotopic element meaning it has a single stable isotope making it primordial isotope. 23Na is a single isotope since earth was formed. It has a standard atomic mass of 22.989 769 28(2) u.
22Na, a positron-emitting isotope with a long half life = 2.605 years. It is used to create test objects and point sources for PET or positron emission tomography.
Properties of elements usually repeated at regular intervals when the elements were arranged in order of increasing Atomic mass.
The properties of elements are a periodic function of their atomic masses. Mendeleev found that when elements are arranged in the order of increasing atomic mass ,the elements with similar properties occur at regular intervals. Mendeleev's periodic table means that if elements are arranged in the order of increasing atomic masses then the properties of elements are repeated after regular intervals or period. He arranged 63 elements in the order of increasing atomic masses in horizontal row but in such a way that elements having similar properties came directly under one another in the same vertical columns or groups.
To learn more about Mendeleev's Periodic table please visit:
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First convert 1.50 grams of butane to moles by dividing it
with its molar weight which is 58 g. After getting the number of moles of
butane, multiply the amount of moles to four since butane has four carbons.
Thus the answer would be 0.026 moles.
One
Let's start by stating what we know is wrong. Equilibrium is achieved when the reactants and products have a stable concentration. That makes D incorrect. Equilibrium is not established until about the 6th or 7th second.
The fact that you get any products at all means that the reactants will become products. Just who is favored has to be looked at very carefully. The products start very near 0. They go up until their concentration at equilibrium. When the reach equilibrium, the products have increased to 17. The reactants have dropped from 40 to 27. By a narrow margin, I would say the products are favored.
C is incorrect. There are still reactants left.
E is incorrect. the reactants started out with a concentration of 40. The reaction is not instantaneous. The concentration was highest at 40 or right at the beginning. This assumes that the reactants were mixed and the products were produced and the water/liquid amount has not changed.
B is incorrect. The concentration of the reactants is higher at equilibrium.
A is wrong. It is product favored.
I'm getting none of the above.
Problem Two
AgBr is insoluble (very). You'd have to work very hard to get them to separate into their elemental form. Just putting AgBr in water isn't enough. Lots of heat and lots of electricity are needed to get the elemental form.
I suppose you should pick B. Mass must be preserved. But if you balanced the equation, it would work with heat and electricity.